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async.py
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async.py
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#
# This file is part of the v4l2py project
#
# Copyright (c) 2023 Tiago Coutinho
# Distributed under the GPLv3 license. See LICENSE for more info.
# Extra dependencies required to run this example:
# python3 -m pip install fastapi jinja2 python-multipart opencv-python \
# pillow uvicorn
# run from this directory with:
# uvicorn async:app
"""FastAPI example for v4l2py"""
import asyncio
import logging
from typing import Annotated
from common import BOUNDARY, BaseCamera, frame_to_image
from fastapi import FastAPI, Form, Request
from fastapi.responses import HTMLResponse, StreamingResponse
from fastapi.staticfiles import StaticFiles
from fastapi.templating import Jinja2Templates
from v4l2py.device import ControlType, Device, iter_video_capture_devices
logging.basicConfig(
level="INFO",
format="%(threadName)-10s %(asctime)-15s %(levelname)-5s %(name)s: %(message)s",
)
log = logging.getLogger(__name__)
class Camera(BaseCamera):
def __init__(self, device: Device) -> None:
super().__init__(device)
self.clients: asyncio.Queue = asyncio.Queue()
self.runner: None | asyncio.Task = None
async def get_clients(self, timeout=None) -> None | list[asyncio.Queue]:
first_client = self.clients.get()
if timeout is None:
clients = [await first_client]
else:
try:
clients = [await asyncio.wait_for(first_client, timeout)]
except asyncio.TimeoutError:
return
while not self.clients.empty():
clients.append(self.clients.get_nowait())
return clients
def start(self) -> None:
if not self.is_running:
name = f"Run {self.device.filename}"
self.device.log.info("Start")
self.runner = asyncio.create_task(self.run(), name=name)
def stop(self) -> None:
if self.runner:
self.device.log.info("Stop")
self.runner.cancel()
self.runner = None
@property
def is_running(self):
return not (self.runner is None or self.runner.done())
async def run(self):
with self.device:
self.capture.set_format(640, 480, "MJPG")
with self.capture as frames:
async for frame in frames:
if clients := await self.get_clients(timeout=3):
data = frame_to_image(frame)
for client in clients:
await client.put(data)
else:
self.device.log.info("Stopping camera task due to inactivity")
break
CAMERAS = None
def cameras() -> list[Camera]:
global CAMERAS
if CAMERAS is None:
cameras = {}
for device in iter_video_capture_devices(legacy_controls=True):
cameras[device.index] = Camera(device)
CAMERAS = cameras
return CAMERAS
app = FastAPI()
app.mount("/static", StaticFiles(directory="static"), name="static")
templates = Jinja2Templates(directory="templates", line_statement_prefix="#")
@app.get("/")
def index(request: Request):
return templates.TemplateResponse(
"index.html", {"request": request, "cameras": cameras()}
)
@app.get("/camera/{device_id}")
def device(request: Request, device_id: int):
camera = cameras()[device_id]
with camera.device:
ctx = {"request": request, "camera": camera, "ControlType": ControlType}
return templates.TemplateResponse("device.html", ctx)
@app.post("/camera/{device_id}/start")
async def start(device_id: int):
camera = cameras()[device_id]
camera.start()
return HTMLResponse(
f'<img src="/camera/{device_id}/stream" width="640" alt="{camera.info.card}"/>'
)
@app.post("/camera/{device_id}/stop")
async def stop(device_id: int):
camera = cameras()[device_id]
camera.stop()
return HTMLResponse('<img src="/static/cross.png" width="640" alt="no video"/>')
@app.get("/camera/{device_id}/stream")
async def stream(device_id: int):
camera = cameras()[device_id]
async def gen_frames():
queue = asyncio.Queue()
while True:
await camera.clients.put(queue)
yield await queue.get()
return StreamingResponse(
gen_frames(), media_type=f"multipart/x-mixed-replace; boundary={BOUNDARY}"
)
@app.post("/camera/{device_id}/format")
def set_format(device_id: int, value: Annotated[str, Form()]):
width, height, fmt = map(int, value.split())
camera = cameras()[device_id]
with camera.device:
camera.capture.set_format(width, height, fmt)
return "", 204
@app.post("/camera/{device_id}/control/{control_id}")
def set_control(device_id: int, control_id: int, value: str = Form(default="0")):
camera = cameras()[device_id]
with camera.device:
control = camera.device.controls[control_id]
camera.device.log.info("setting %s to %s", control.name, value)
if value == "on":
value = 1
elif value == "off":
value = 0
else:
value = int(value)
control.value = value
return "", 204
@app.post("/camera/{device_id}/control/{control_id}/reset")
def reset_control(request: Request, device_id: int, control_id: int):
camera = cameras()[device_id]
with camera.device:
control = camera.device.controls[control_id]
control.value = control.info.default_value
ctx = {"request": request, "control": control, "ControlType": ControlType}
return templates.TemplateResponse("control.html", ctx)